It shall be sufficient to entitle the widow of a Confederate veteran to a pension as the widow of such veteran if such widow prove her relationship and (a) that she was living with her husband as his faithful wife at the time of his death, that the reason for not living with him was caused by no fault of hers or (b) that she had been married to such veteran ten years prior to his death. But the uncorroborated testimony of the widow shall not be sufficient proof of such facts.